HP Dc7800 Technical Reference Guide: HP Compaq dc7800 Series Business Desktop - Page 81
Power and Signal Distribution
UPC - 883585764365
View all HP Dc7800 manuals
Add to My Manuals
Save this manual to your list of manuals |
Page 81 highlights
7 Power and Signal Distribution 7.1 Introduction This chapter describes the power supplies and discusses the methods of general power and signal distribution. Topics covered in this chapter include: ■ Power distribution (7.2) ■ Power Control (7.3) ■ Signal distribution (7.4) 7.2 Power Distribution Each form factor uses a unique power supply assembly and implements different methods of power generation and distribution. The USDT form factor uses an external ("brick") supply while the SFF and CMT form factors use a power supply unit contained within the system chassis. The subassemblies are not interchangeable between the three form factors. 7.2.1 USDT Power Distribution The USDT form factor uses an external ("brick") supply that connects to the chassis through a three-conductor cable (Figure 7-1). All voltages required by the processing circuits, peripherals, and storage devices are produced on the system board from the 19.0 VDC produced by the extrernal power supply assembly. The external power supply always produces 19.0 VDC as long as it is connected to an active AC outlet. Front Bezel Power Button USDT Chassis System Board Power On Power Logic, Voltage Regulators 90 - 264 VAC +19.0 Rtn VDC Pwr rating & ID External Power Supply Unit Figure 7-1. USDT Power Generation, Block Diagram Technical Reference Guide www.hp.com 7-1